Table of Contents
- 1 Why does cellular respiration have 3 steps?
- 2 What is the purpose of Step 2 in cellular respiration?
- 3 What is the second process in cellular respiration?
- 4 Why does the energy have to be released step by step in cellular respiration?
- 5 How is the rate of the respiration cycle controlled?
- 6 What happens to the glucose molecule during cellular respiration?
Why does cellular respiration have 3 steps?
4.10 Summary. Cellular respiration is the aerobic process by which living cells break down glucose molecules, release energy, and form molecules of ATP . Generally speaking, this three-stage process involves glucose and oxygen reacting to form carbon dioxide and water.
What is the purpose of Step 2 in cellular respiration?
The second step in cellular respiration is called the Krebs cycle. The Krebs cycle uses pyruvic acid to create ATP, along with additional molecules like NADH, FADH2, and CO2. The NADH and FADH2 molecules are used during the final step of cellular respiration, while the CO2 is exhaled.
Why does cellular respiration occur in a series of steps?
Cellular respiration is a series of stages and reactions that cells use to “make” energy. This process is used by both plant and animal cells. It lets cells release energy from food gradually. If the energy was released all at once, most of it would be lost through heat and light.
What are the three stages of cellular respiration and what occurs in each stage?
Cellular respiration is the process in which cells break down glucose, release the stored energy, and use it to make ATP. The process begins in the cytoplasm and is completed in a mitochondrion. Cellular respiration occurs in three stages: glycolysis, the Krebs cycle, and electron transport.
What is the second process in cellular respiration?
The citric acid cycle (also known as the Krebs cycle) is the second pathway in cellular respiration, and it also takes place in the mitochondria. The rate of the cycle is controlled by ATP concentration. When there is more ATP available, the rate slows down; when there is less ATP the rate increases.
Why does the energy have to be released step by step in cellular respiration?
The cells of living things also get energy by “burning.” They “burn” glucose in the process called cellular respiration. Inside every cell of all living things, energy is needed to carry out life processes. Energy is required to break down and build up molecules and to transport many molecules across plasma membranes.
Which step of cellular respiration is responsible for making the most ATP molecules?
Electron transport chain This stage produces most of the energy ( 34 ATP molecules, compared to only 2 ATP for glycolysis and 2 ATP for Krebs cycle). The electron transport chain takes place in the mitochondria. This stage converts the NADH into ATP.
What are the steps in the cellular respiration process?
Cellular respiration is a metabolic pathway that breaks down glucose and produces ATP. The stages of cellular respiration include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation.
How is the rate of the respiration cycle controlled?
The rate of the cycle is controlled by ATP concentration. When there is more ATP available, the rate slows down; when there is less ATP the rate increases. This pathway is a closed loop: the final step produces the compound needed for the first step.
What happens to the glucose molecule during cellular respiration?
During cellular respiration, a glucose molecule is gradually broken down into carbon dioxide and water. Along the way, some ATP is produced directly in the reactions that transform glucose.
Where does most of the ATP in cellular respiration come from?
Each turn of the citric acid cycle provides a net gain of CO 2, 1 GTP or ATP, and 3 NADH and 1 FADH 2. Most ATP from glucose is generated in the electron transport chain. It is the only part of cellular respiration that directly consumes oxygen; however, in some prokaryotes, this is an anaerobic pathway.